Terrific idea! Except now we have to pay two actors instead of just one.

In Superman II, there's a recorded message from Lara when Kal/Clark asks about a romantic relationship with a human female. It's a very tender and touching moment. Doesn't take, of course.
Seriously, you have a very good point. In "reality," that's probably what would have happened, assuming Krypton was not a strict patriarchal society. Remember that Nor wanted to marry Zara to become ruler and the little woman couldn't be in charge herself, so that might not apply. Besides, maybe she was better with the camera than he was.